var url="http://www.allocertif.com/" ;
var logo="http://www.allocertif.com/img/allocertif_logo.gif";

function count_certif(id, url)
{
  if(document.images)
  (new Image()).src=url + '/in.php?url_id=' + id;
  return true;
}

document.write("<a href=\'"+ url +"\' target=\'_blank\' onClick=\"count_certif(\'" + id +"\', \'" + url +"\');\"><img src=\'" + logo +"\' border=0 alt=\'" + url+"\'></a>") ;